Why Do Property Taxes Increase After You Buy a Home in Michigan?
What causes tax "uncapping," and how can you estimate your real payment before you make an offer?
Fair Housing Notice: This article provides general educational information about Michigan property taxes. The information is intended for all property owners, buyers, and sellers and does not apply differently based on race, color, religion, national origin, sex, disability, familial status, or any other protected class under federal, state, or local Fair Housing laws.
You found the house. The price is right. The mortgage payment fits your budget.
Then you close, move in, and get your first tax bill.
It is significantly higher than what the previous owner was paying. No one warned you. Nothing in the listing mentioned it. And now you are recalculating a monthly budget you thought you had already figured out.
This is not a mistake. It is not a billing error. It is a built-in feature of Michigan's property tax system, and it catches thousands of buyers off guard every single year.
The mechanism is called uncapping. It is the result of a 1994 constitutional amendment called Proposal A, and it means that the taxes a seller paid on a property are almost never the taxes a new buyer will pay. In markets like Jackson County and the Southern Michigan Corridor, where many properties have been owned for a decade or more, the gap between what a seller is paying and what a buyer will owe can be enormous.
This article explains exactly how uncapping works, why it happens, what it means for buyers and sellers in our market, and most importantly, how to calculate your actual post-purchase tax obligation before you make an offer. Because the time to understand your property tax bill is before you sign the purchase agreement, not after.
What Was Michigan Property Tax Like Before Proposal A?
Before 1994, Michigan's property tax system was straightforward in principle, if painful in practice.
Every property was assessed at 50% of its estimated market value. That number was called the Assessed Value. When the market went up, Assessed Values went up. When Assessed Values went up, tax bills went up. There was no ceiling, no annual cap, and no protection for long-term homeowners against rapid market appreciation.
If your neighborhood became more desirable, your taxes went up whether you benefited from that appreciation or not. Many longtime homeowners were watching their tax bills increase faster than their household budgets could absorb. The system was widely criticized as punishing stability and rewarding turnover.
In March 1994, Michigan voters approved Proposal A, a sweeping constitutional amendment that restructured how property taxes were calculated. The most significant change it made: it created a second value called Taxable Value, and it capped how much that value could increase each year.
The cap has protected Michigan homeowners from runaway tax increases for three decades. It has also created a built-in disconnect between what sellers pay and what buyers will owe.
What Is the Difference Between Assessed Value and Taxable Value?
This is the foundation of understanding uncapping, so it is worth taking a moment to get it right.
Assessed Value (AV) is determined by your local assessor each year. State law requires it to equal approximately 50% of your property's estimated market value, also called True Cash Value. If your home is worth $250,000 on the open market, your Assessed Value should be approximately $125,000. It tracks the market. When values in your neighborhood rise, your Assessed Value rises with them.
Taxable Value (TV) is the number your actual tax bill is based on. Under Proposal A, Taxable Value increases are capped at the Inflation Rate Multiplier (IRM) or 5%, whichever is lower, as long as the same owner holds the property. The IRM is a statewide figure calculated annually by the Michigan State Tax Commission. For 2026, the IRM is 1.027, meaning Taxable Values for properties with no ownership change can rise by no more than 2.7%.
The critical rule: Taxable Value can never exceed Assessed Value. But Taxable Value can be far below Assessed Value, especially for long-term owners.
Here is why the gap forms.
Imagine a homeowner who bought their house in 2005. Their Taxable Value at the time was $80,000. Over the next 20 years, even at the maximum annual cap, that Taxable Value grew slowly. Meanwhile, the market moved significantly. By 2026, the Assessed Value on the same property might be $140,000, reflecting a market value of roughly $280,000.
The existing owner is paying taxes on a Taxable Value of perhaps $100,000. A buyer in 2026 will pay taxes on the full current Assessed Value of $140,000. That is not a modest difference. On a typical Jackson County millage rate, that gap could represent $1,000 to $2,000 or more in additional annual taxes.
What Is Tax Uncapping and Why Does It Happen?
Uncapping is the reset that occurs in the calendar year following a transfer of ownership.
When you buy a property, Michigan law treats that as a transfer of ownership under Section 211.27a of the General Property Tax Act. The year after you close, your Taxable Value is reset to equal the current Assessed Value, which should be approximately 50% of market value. The cap that protected the previous owner disappears. Your Taxable Value starts fresh at the new, higher number.
The year of purchase is not the problem. In the year you buy, you are still taxed on the previous owner's capped Taxable Value. That number may be low, and your first tax bill may feel manageable.
The year after purchase is the surprise. In January following your purchase, the assessor resets your Taxable Value to match the current Assessed Value. Your tax bill reflects that new, higher number. For buyers who did not account for this in their pre-purchase calculations, the increase can feel like it came from nowhere.
This is the "pop-up" that Michigan property tax professionals refer to. It is legal, it is accurate, and it is entirely predictable if you know to look for it.
After the reset, your Taxable Value is capped again under the standard IRM rules. Going forward, your taxes will increase slowly and predictably each year until another transfer of ownership occurs.
How Large Can the Uncapping Gap Be in Jackson County?
The size of the uncapping impact depends entirely on one thing: how long the previous owner held the property and how much the market moved during that time.
A property sold after two or three years of ownership may have a modest gap between Taxable Value and Assessed Value. The IRM increases are slow, but so is the drift.
A property sold after 15 or 20 years of ownership in a rising market can have a dramatic gap. In parts of Jackson County and the broader Southern Michigan Corridor, where many homeowners have held properties since the late 1990s or early 2000s, that gap is often substantial.
How Do You Estimate Your Real Property Tax Before Making an Offer?
This is the section that will save you from an unpleasant surprise. The information you need is publicly available. It takes less than ten minutes to find, and it is one of the most important calculations you can make before submitting a purchase offer on any Michigan property.
Step 1: Find the current Assessed Value on the property.
This is public information. In Jackson County, you can search the Jackson County Equalization Department's property records by address or parcel number. Most Michigan county assessor or equalization websites offer a public search portal. What you are looking for is the current year's Assessed Value, also labeled SEV (State Equalized Value). This number represents approximately 50% of the property's estimated market value.
This is the number that will become your new Taxable Value in the year following your purchase.
Step 2: Find the current millage rate for your specific location.
Millage rates vary by township, city, and school district. A home in the City of Jackson pays a different rate than a home in Summit Township, Leoni Township, or Grass Lake Township. The Michigan Department of Treasury's Property Tax Estimator at treas-secure.state.mi.us/ptestimator allows you to select your county, township or city, and school district to see the applicable millage rates.
Millage is expressed in mills. One mill equals $1 of tax per $1,000 of Taxable Value. A millage rate of 35 mills on a Taxable Value of $100,000 equals $3,500 in annual property taxes.
Step 3: Determine whether you will qualify for the Principal Residence Exemption.
If you intend to live in the home as your primary residence, you will qualify for the Principal Residence Exemption (PRE), formerly known as the Homestead Exemption. The PRE exempts your home from up to 18 mills of local school operating taxes. That is a significant reduction. A property with a 40-mill total rate pays only 22 mills under a full PRE.
You apply for the PRE by filing Form 2368 with your local township or city assessor. This is typically handled at closing by your title company, but you should confirm it has been filed. The deadline to claim the PRE for the summer tax levy is June 1st. If you purchase a home and occupy it as your primary residence but miss the filing deadline, you may owe non-homestead rates for part of that year.
Step 4: Do the math.
Your estimated annual tax after uncapping is:
Current Assessed Value (SEV) divided by 1,000, multiplied by your applicable millage rate.
If you qualify for the PRE, subtract 18 mills from the total millage rate before multiplying.
A worked example for a Jackson County buyer:
A home in Summit Township is listed for $230,000. The current Assessed Value is $115,000. The applicable millage rate for that location and school district is 38 mills homestead. The buyer will occupy as a primary residence.
Estimated homestead millage: 38 minus 18 equals 20 mills.
Annual tax estimate: $115,000 divided by 1,000, multiplied by 20 equals $2,300 per year.
Monthly tax estimate: $2,300 divided by 12 equals approximately $192 per month.
Compare that to what the current owner is paying. If their Taxable Value is $85,000, they are paying $85,000 divided by 1,000 multiplied by 20 equals $1,700 per year, or approximately $142 per month.
The buyer will pay approximately $600 more per year, or $50 more per month, than the seller was paying. That is money that needs to be in the monthly budget before the offer is written.
Step 5: Use the Michigan Treasury's official estimator to verify.
The Michigan Department of Treasury's Property Tax Estimator at treas-secure.state.mi.us/ptestimator allows future buyers to enter the SEV of a property and receive an estimated tax figure for homestead and non-homestead properties. Enter the SEV from Step 1 into the "future owners" field. The tool will do the calculation for you using actual millage rates for that location.
This is the most reliable pre-purchase estimate available. Use it on every property you seriously consider.
What Transfers Trigger Uncapping and Which Ones Do Not?
Not every transfer of ownership results in uncapping. Michigan law carves out a specific list of exempt transfers under Section 211.27a(7) of the General Property Tax Act. Understanding these exceptions matters for estate planning, family transfers, and certain business transactions.
Transfers that do NOT trigger uncapping include:
A transfer between spouses, including from a deceased spouse to a surviving spouse. This is one of the most commonly used exceptions and has protected many Michigan families from a sudden tax increase at the time of a spouse's death.
A transfer of residential property to an immediate family member, defined as the transferor's or transferor's spouse's parent, sibling, child, adopted child, grandchild, or in certain cases grandparent, provided the property is not used for a commercial purpose after the transfer. This exception was added by Michigan legislation in 2014 and has allowed many families to transfer homes between generations without triggering the tax reset.
A transfer among commonly controlled business entities, including affiliated corporations, partnerships, or LLCs, under specific conditions defined in the statute.
Transfers that DO trigger uncapping include:
A standard arm's-length sale from seller to buyer. This is the most common situation and what this article primarily addresses.
A transfer by land contract entered into after December 31, 1994. The uncapping occurs in the year following the execution of the land contract, not when the deed is ultimately recorded.
A transfer into a trust where the beneficiary is someone other than the current owner or the owner's spouse, under most circumstances.
A transfer of an interest in a limited liability company or other entity that effectively transfers control of real property.
The application of these rules can be nuanced, particularly in estate planning and certain ownership-transfer situations. If you are transferring property as part of a broader financial or family strategy, consult a Michigan real estate attorney or tax professional before proceeding. An unintentional uncapping event can result in a significant and irreversible increase in annual taxes.
What Is the Principal Residence Exemption and How Do You Make Sure You Have It?
The Principal Residence Exemption (PRE) is one of the most valuable tax benefits available to Michigan homeowners, and it is also one of the most commonly misunderstood.
A PRE exempts your primary residence from up to 18 mills of local school district operating taxes. On a property with a total millage rate of 40 mills, a full PRE reduces your effective rate to 22 mills. That is a reduction of 45% in the school operating portion of your taxes. Over time, on a home with a Taxable Value of $100,000 or more, the PRE can save a homeowner $1,500 to $2,000 or more per year compared to non-homestead rates.
To qualify, you must own and occupy the property as your principal residence. You may only hold one PRE in Michigan at a time. If you own a home in Jackson County and a cottage up north, only one of them can carry the exemption.
How to claim it:
File Form 2368, the Principal Residence Exemption Affidavit, with the assessor for the township or city where the property is located. The deadline is June 1st for the summer tax levy and November 1st for the winter levy. In most residential purchases, the closing agent or title company provides this form at closing and helps the buyer submit it. Confirm that this step was completed.
What happens if the previous owner also had a PRE:
In most cases, when a property already carries a PRE and you are buying it as your primary residence, the transition is straightforward. You file your own Form 2368. The old exemption rescission and your new claim are typically handled together at closing.
What happens if you purchase a non-homestead property:
If you buy a rental, a second home, or an investment property that did not have a PRE, and you plan to occupy it as your primary residence, you will need to file Form 2368 to establish the exemption. The tax savings are significant and the paperwork is minimal.
A note on investor purchases and rentals:
If you are buying a property as an investment and will not occupy it as your primary residence, the PRE does not apply and you will pay the full millage rate. Non-homestead millage rates in Jackson County are typically 18 mills higher than homestead rates. This difference must be included in any rental property income and expense analysis.
What Is the Home 1st Real Estate Approach to Property Tax Education?
At Home 1st Real Estate, we believe that a buyer who understands what they are actually buying is a buyer who can make a confident, well-informed decision.
Property taxes are not a footnote. They are a recurring monthly cost that affects your budget for as long as you own the home. In Michigan, because of uncapping, the taxes a seller paid are often not the taxes a buyer will owe. The tax figure shown on a listing may not reflect what a future owner will pay, which is why it is important to explain how uncapping works before an offer is made.
Our agents walk every buyer through a pre-offer tax estimate before they submit. We pull the current Assessed Value from public records, identify the correct millage rate for the specific township and school district, calculate the post-uncapping estimate with and without the PRE, and make sure the resulting monthly cost is reflected in the buyer's total budget picture.
What we bring to every buyer consultation:
A pre-offer property tax estimate using current county assessment data, not the seller's tax bill. Guidance on the Principal Residence Exemption filing process and deadlines. Clarity on how the uncapping timeline works so there are no surprises in the first full year of ownership. Connections to local title professionals who handle PRE filings correctly at closing. And ongoing access to our team when questions come up after you move in.
If you are shopping for a home in Jackson County or the Southern Michigan Corridor and you have not yet run a post-uncapping tax estimate on the properties you are considering, that is a conversation worth having before you make an offer.
Contact the Home 1st Real Estate team for a no-pressure buyer consultation.
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What Does the Data Tell Us About Property Taxes and Buyer Preparedness?
The uncapping problem is not unique to Jackson County. It is a structural feature of Michigan's tax system that affects buyers in every township and city in the state. But it falls hardest on buyers in markets where long-term ownership is common, where homes have been held for a decade or more, and where the gap between a seller's Taxable Value and the current Assessed Value has had the most time to grow.
The Michigan State Tax Commission confirmed a 2026 Inflation Rate Multiplier of 1.027 (2.7%). That is the maximum a capped property's Taxable Value can increase this year. Meanwhile, in many Southern Michigan markets, assessed values have been rising faster than the IRM for several consecutive years as housing demand remains strong. The gap between long-term sellers' Taxable Values and current Assessed Values continues to widen.
The Michigan Department of Treasury's Property Tax Estimator at treas-secure.state.mi.us/ptestimator is the official tool for pre-purchase tax estimates. It uses current millage rates by township, city, and school district and gives both homestead and non-homestead estimates. It is free, it is accurate, and far too few buyers use it before making an offer.
According to the Michigan Taxpayer's Guide, published annually by the Michigan Legislature, uncapping occurs for every non-exempt transfer of ownership, and the pop-up in Taxable Value is permanent until the next ownership change. There is no appeal process for uncapping itself. It is a function of state statute, and no local assessor has the authority to disregard it.
The most reliable protection against a property tax surprise is the same as the protection against most real estate surprises: a knowledgeable, locally experienced professional who checks these numbers before you commit.
Frequently Asked Questions About Michigan Property Tax Uncapping
Why are my property taxes higher than what the previous owner was paying?
Because of Proposal A and Michigan's tax uncapping rules, the taxes a seller pays are based on their capped Taxable Value, which may be significantly lower than the current Assessed Value. When ownership transfers, that cap is removed. In the calendar year following your purchase, your Taxable Value resets to equal the current Assessed Value. Your taxes go up accordingly. This is not an error. It is the law, and it applies to every non-exempt residential purchase in Michigan.
When exactly does uncapping take effect?
Uncapping does not happen in the year you buy. In the year of purchase, you are still taxed on the previous owner's Taxable Value. The uncapping takes effect on January 1st of the calendar year following your purchase. If you close on a home in April 2026, your 2026 taxes are based on the prior owner's capped Taxable Value. Your 2027 taxes will be based on the 2027 Assessed Value, which is calculated from the 2026 transfer. The first full tax bill reflecting your post-uncapping Taxable Value arrives in 2027.
Can the assessor set my Taxable Value equal to my purchase price?
No. Michigan law explicitly prohibits assessors from using a single sale to set a property's True Cash Value and Assessed Value. Assessors use a mass appraisal methodology based on a two-year sales study of comparable properties in the community. Your purchase price may be above or below the resulting Assessed Value. The Assessed Value is not automatically 50% of what you paid. It is the assessor's independent determination of 50% of estimated market value. You have the right to appeal your assessment each year at the March Board of Review, which begins hearings on the second Monday in March. If you disagree with the Board of Review's decision, you may appeal further to the Michigan Tax Tribunal by July 31st for residential property.
What is the fastest way to estimate my property taxes before making an offer?
Pull the current Assessed Value (SEV) from your county's public property records. Go to the Michigan Department of Treasury's Property Tax Estimator at treas-secure.state.mi.us/ptestimator. Select your county, city or township, and school district. Enter the SEV in the future owner field. The tool will return a homestead and non-homestead estimate using current millage rates. This is your best pre-offer estimate. Compare it to the seller's current tax bill to understand the full impact of uncapping.
How do I make sure I get the Principal Residence Exemption?
File Form 2368, the Principal Residence Exemption Affidavit, with the assessor of the township or city where the property is located. The deadline is June 1st for the summer tax levy and November 1st for the winter levy. In most purchase transactions, your closing agent or title company will provide this form and ensure it is submitted as part of the closing process. If you are unsure whether it was filed, contact your local assessor's office directly. Failure to file the PRE means you will pay the full non-homestead millage rate, which is approximately 18 mills higher than the homestead rate.
Does uncapping apply to family transfers or inherited property?
Not always. Transfers between spouses do not trigger uncapping. Transfers of residential property to immediate family members, including parents, siblings, children, and grandchildren, are generally exempt from uncapping as long as the property is not used for commercial purposes after the transfer. These exemptions were added or expanded by Michigan legislation, most significantly in 2014. Estate planning transfers should be reviewed carefully with a Michigan real estate attorney to ensure the intended exemption applies and the transfer is structured correctly.
Can I appeal my property tax assessment if I think it is too high?
Yes. You have the right to appeal your Assessed Value each year at the March Board of Review, which begins its appeal hearings on the second Monday in March in most Michigan communities. You must appeal the Assessed Value, not the Taxable Value or the uncapping itself, as uncapping is a statutory calculation that the Board of Review cannot override. Bring comparable sales data, recent appraisals, or other evidence that the Assessed Value exceeds 50% of your property's true market value. If you disagree with the Board of Review's decision, you may appeal further to the Michigan Tax Tribunal. For residential property, the Tax Tribunal deadline is July 31st of the tax year involved. A prior appeal to the March Board of Review is required before the Tax Tribunal will accept a residential valuation appeal.
I am buying an investment property. How does uncapping affect my numbers?
Investment and rental properties are not eligible for the Principal Residence Exemption, so you will pay the full non-homestead millage rate. That rate is typically 18 mills higher than the homestead rate. Add this to the post-uncapping Taxable Value calculation when analyzing a potential investment property. A rental property in Jackson County with an Assessed Value of $80,000 and a non-homestead millage rate of 50 mills, for example, would carry an estimated annual tax burden of $4,000. That number needs to be factored into your rental income analysis, cash flow projections, and purchase price decision before you make an offer.
Wondering What Your Tax Bill Will Be After You Buy?
Whether you are buying your first home, upgrading to something larger, or adding to an investment portfolio in Southern Michigan, your post-uncapping tax estimate is one of the most important numbers you can know before you make an offer.
Call Home 1st Real Estate at 517.780.8090 and ask us to walk through the tax numbers on any property you are considering. We will pull the current Assessed Value, identify the right millage rate for that specific location, and give you a realistic monthly tax figure before you commit to anything.
Or contact us online and one of our Southern Michigan-based agents will reach out within 24 hours.
We are not trying to talk you out of buying. We are trying to make sure you know exactly what you are buying, including what it will cost every month after the ink is dry.
Because at Home 1st Real Estate, an informed buyer is a confident buyer. And a confident buyer makes better decisions. Every time.
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Michigan State Tax Commission, Bulletin 14 of 2025, Calculation of the 2026 Inflation Rate Multiplier, December 2025
Michigan Department of Treasury, Property Tax Estimator, treas-secure.state.mi.us/ptestimator
Michigan Legislature, MCL 211.27a, General Property Tax Act, Section 211.27a
Michigan Legislature, Taxpayer's Guide 2025, published annually
City of Novi Assessing Department, Proposal A FAQ, 2026
Macomb Township Assessing Department, Proposal A Overview, 2026
Michigan Municipal League, Headlee Amendment and 2026 IRM Calculation, December 2025
Michigan Department of Treasury, Principal Residence Exemption Guidelines, michigan.gov/taxes
City of Southfield Assessing Department, Uncapping Residential Property Taxes Overview
Maddin Hauser Law, Pulling the Cap Off of Uncapping Events in Michigan, December 2023
